projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d94e2462 M |
1 | # |
| 2 | /* | |
| 3 | * | |
| 4 | * UNIX debugger | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #include "defs.h" | |
| 9 | ||
| 10 | ||
| 11 | MSG ODDADR; | |
| 12 | MSG BADDAT; | |
| 13 | MSG BADTXT; | |
| 14 | MAP txtmap; | |
| 15 | MAP datmap; | |
| 16 | INT wtflag; | |
| 17 | STRING errflg; | |
| 18 | INT errno; | |
| 19 | ||
| 20 | INT pid; | |
| 21 | ||
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | /* file handling and access routines */ | |
| 26 | ||
| 27 | put(adr,space,value) | |
| 28 | L_INT adr; | |
| 29 | { | |
| 30 | access(WT,adr,space,value); | |
| 31 | } | |
| 32 | ||
| 33 | POS get(adr, space) | |
| 34 | L_INT adr; | |
| 35 | { | |
| 36 | return(access(RD,adr,space,0)); | |
| 37 | } | |
| 38 | ||
| 39 | POS chkget(n, space) | |
| 40 | L_INT n; | |
| 41 | { | |
| 42 | REG INT w; | |
| 43 | ||
| 44 | w = get(n, space); | |
| 45 | chkerr(); | |
| 46 | return(w); | |
| 47 | } | |
| 48 | ||
| 49 | access(mode,adr,space,value) | |
| 50 | L_INT adr; | |
| 51 | { | |
| 52 | INT w, w1, pmode, rd, file; | |
| 53 | rd = mode==RD; | |
| 54 | ||
| 55 | IF space == NSP THEN return(0); FI | |
| 56 | ||
| 57 | IF pid /* tracing on? */ | |
| 58 | THEN IF (adr&01) ANDF !rd THEN error(ODDADR); FI | |
| 59 | pmode = (space&DSP?(rd?RDUSER:WDUSER):(rd?RIUSER:WIUSER)); | |
| 60 | w = ptrace(pmode, pid, shorten(adr&~01), value); | |
| 61 | IF adr&01 | |
| 62 | THEN w1 = ptrace(pmode, pid, shorten(adr+1), value); | |
| 63 | w = (w>>8)&LOBYTE | (w1<<8); | |
| 64 | FI | |
| 65 | IF errno | |
| 66 | THEN errflg = (space&DSP ? BADDAT : BADTXT); | |
| 67 | FI | |
| 68 | return(w); | |
| 69 | FI | |
| 70 | w = 0; | |
| 71 | IF mode==WT ANDF wtflag==0 | |
| 72 | THEN error("not in write mode"); | |
| 73 | FI | |
| 74 | IF !chkmap(&adr,space) | |
| 75 | THEN return(0); | |
| 76 | FI | |
| 77 | file=(space&DSP?datmap.ufd:txtmap.ufd); | |
| 78 | IF longseek(file,adr)==0 ORF | |
| 79 | (rd ? read(file,&w,2) : write(file,&value,2)) < 1 | |
| 80 | THEN errflg=(space&DSP?BADDAT:BADTXT); | |
| 81 | FI | |
| 82 | return(w); | |
| 83 | ||
| 84 | } | |
| 85 | ||
| 86 | chkmap(adr,space) | |
| 87 | REG L_INT *adr; | |
| 88 | REG INT space; | |
| 89 | { | |
| 90 | REG MAPPTR amap; | |
| 91 | amap=((space&DSP?&datmap:&txtmap)); | |
| 92 | IF space&STAR ORF !within(*adr,amap->b1,amap->e1) | |
| 93 | THEN IF within(*adr,amap->b2,amap->e2) | |
| 94 | THEN *adr += (amap->f2)-(amap->b2); | |
| 95 | ELSE errflg=(space&DSP?BADDAT:BADTXT); return(0); | |
| 96 | FI | |
| 97 | ELSE *adr += (amap->f1)-(amap->b1); | |
| 98 | FI | |
| 99 | return(1); | |
| 100 | } | |
| 101 | ||
| 102 | within(adr,lbd,ubd) | |
| 103 | L_INT adr, lbd, ubd; | |
| 104 | { | |
| 105 | return(adr>=lbd && adr<ubd); | |
| 106 | } |